Advances in Fuzzy Systems

Research Article

A Geometric Fuzzy-Based Approach for Airport Clustering

Table 3

Clustering results with prefixed number of clusters. Criterion: yearly passengers.


Metrics	ED	FHD	KD

Cluster 1 (centre: Roma FCO)
≤20%	30, 19, 18, 4, 36	30, 19, 18, 4	30, 19, 18, 4
20%–40%	10, 20, 29, 5, 22, 26, 9	36, 10, 20, 29, 5, 22, 26	36, 10, 20, 29, 5, 22
>40%	32, 37, 3, 34, 21, 13, 17, 1, 16, 8, 35, 33, 15, 2, 27, 25, 28, 23, 7, 12, 24, 6, 14, 11, 38, 31	9, 32, 37, 3, 34, 21, 13, 17, 1, 16, 8, 35, 33, 15, 2, 27, 25, 28, 23, 7, 12, 24, 6, 14, 11, 38, 31	9, 26, 32, 37, 3, 34, 21, 13, 17, 1, 16, 8, 35, 33, 15, 2, 27, 25, 28, 23, 7, 12, 24, 6, 14, 11, 38, 31

Cluster 2 (centre: Napoli Capodichino)
≤20%	20, 10	20, 10	20, 10
20%–40%	9, 32, 36, 37, 4, 26, 36, 3, 29, 22,	9, 32, 36, 37, 4, 26, 36, 3, 29, 22,	9, 32, 36, 37, 4, 26, 36, 3, 29, 22,
>40%	18, 30, 19, 26, 5, 21 17, 8, 1, 33, 13, 15, 16, 27, 14, 35, 12, 7, 11, 2, 28, 31, 23, 38, 24, 6	18, 30, 19, 26, 5 21, 17, 8, 1, 33, 13, 15, 16, 27, 14, 35, 12, 7, 11, 2, 28, 31, 23, 38, 24, 6	18, 30, 19, 26, 5 21, 8, 1, 33, 13, 15, 16, 27, 14, 35, 12, 7, 11, 2, 28, 31, 23, 38, 24, 6

Cluster 3 (centre: Lamezia Terme)
≤20%	17, 8, 34	17, 8, 34	17, 8, 34
20%–40%	33, 9, 15, 26, 22, 1	33, 9, 15, 26, 22	33, 9, 15, 26, 22
>40%	29, 37, 21, 3, 5, 20, 32, 10, 4, 14, 27, 36, 17, 18, 30, 19, 7, 12, 13, 11, 25, 16, 31, 38, 35, 28, 23, 2, 6, 34	1, 29, 37, 21, 3, 5, 20, 32, 10, 4, 14, 27, 36, 17, 18, 30, 19, 7, 12, 13, 11, 25, 16, 31, 38, 35, 28, 23, 2, 6, 34	1, 29, 37, 21, 3, 5, 20, 32, 10, 4, 14, 27, 36, 17, 18, 30, 19, 7, 12, 13, 11, 25, 16, 31, 38, 35, 28, 23, 2, 6, 34

Cluster 4 (centre: Reggio Calabria)
≤20%	27, 7, 12	27, 7, 12	27, 7, 12
20%–40%	25, 11, 15, 31, 38, 14	25, 11, 15, 31, 38	25, 11, 15, 31, 38
>40%	33, 16, 13, 8, 17, 28, 23, 35, 34, 26, 9, 22, 29, 2, 6, 24, 1, 21, 5, 20, 3, 32, 10, 4, 36, 18, 30, 19	14, 33, 16, 13, 8, 17, 28, 23, 35, 34, 26, 9, 22, 29, 2, 6, 24, 1, 21, 5, 20, 3, 32, 10, 4, 36, 18, 30, 19	14, 33, 16, 13, 8, 17, 28, 23, 35, 34, 26, 9, 22, 29, 2, 6, 24, 1, 21, 5, 20, 3, 32, 10, 4, 36, 18, 30, 19